Code Development

Code Development

About Code Development

In early 2021, the International Code Council (ICC) made the decision to shift the development of the International Energy Conservation Code (IECC) from a governmental consensus process to a standards development process. This transition makes the IECC the only one of the I-codes to follow this new process, with significant changes being incorporated in real time as the 2024 IECC is developed. EECC and other supporters of efficiency have compiled resources to help interested individuals understand and participate in the revamped process.

Code efficiency:

First Public Comment Period – Residential

The first public comment period for the Residential IECC closed December 16. The monograph of the public comments/code changes is now posted on the IECC Residential Committee website.


First Public Comment Period – Commercial

The first public comment period for the Commercial IECC is now closed. The monograph of the public comments/code changes is now posted on the IECC Commercial Committee website.

Construction workers discuss the building plans

How to Participate

Public comments

Two committees, one for the Commercial code, and one for Residential, oversee the development of the 2024 IECC. At least one-third of the members of each committee are from the Governmental Regulator Interest Category. Committee meetings are open to all interested parties.


Technical experts representing the various subject matters addressed in the energy code evaluate proposals specific to their area of expertise. Each subcommittee consists of half committee members, and half external interested parties. Subcommittee meetings are open to all interested parties. IECC Committee Procedures are outlined in this document.


Proposed changes to the energy code, using the 2021 IECC as a baseline, are submitted through an energy-specific version of cdpACCESS. Proposal submission is open to all members of the public. A login is required, but registration is free.

Public comments

Once the initial draft of the 2024 IECC is complete, it will be published in its entirety for members of the public to offer their support or critique of the changes, as well as to offer new suggestions. The second public comment period will be limited to only the changes from the first draft. More information on the public comment process can be found in this flowchart.

Development Resources

Fact Sheets
Fact Sheet: 2024 IECC Process

Summary of the revised IECC Process: Timelines and Committees

2024 Residential IECC Sign-on Letter (for Governmental Members)

This letter and sign-on form requests that the Residential 2024 IECC Consensus Committee reject any rollbacks that weaken any aspect of the code with respect to the 2021 version, which was decided via the governmental consensus process.

News and Opinions
Blog: Public Comments Critical for the Residential Energy Code (Nov 2022)

The first public comment draft of the 2024 Residential IECC is now available – this is your chance to make your voice heard.

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